diff --git a/src/veritysetup/veritysetup.c b/src/veritysetup/veritysetup.c
index 61973bf37a..1536bb2b88 100644
--- a/src/veritysetup/veritysetup.c
+++ b/src/veritysetup/veritysetup.c
@@ -151,7 +151,7 @@ static int run(int argc, char *argv[]) {
                 size_t l;
 
                 if (argc < 6)
-                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least two arguments.");
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "attach requires at least four arguments.");
 
                 r = unhexmem(argv[5], strlen(argv[5]), &m, &l);
                 if (r < 0)